An OG is leaving Teen Mom OG. Amber Portwood, who starred on the original Teen Mom reality series on MTV and returned alongside Farrah Abraham, Maci McKinney and Catelynn Baltierra for Teen Mom OG, announced she was leaving the series on Twitter.

"Sad to say but I'm not going to be apart of #Teenmomog. The way I have been portrayed and treated is unfair. @MTV sending all my love," Amber tweeted in a series of late-night messages on Thursday, Dec. 15 and Friday, Dec. 16.

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"If I was treated fairly it wouldn't be an issue but it's been nothing but disrespect since the reunion show. Which keeps continuing today," she continued in a series of tweets. "Nothing has been dealt with or has made me feel any safer to even move on with people who have continuously hidden things from the network. The day I'm shown some respect by the people I've worked with for 8 years is the day I'll be back. I've sacrificed a lot for this show."

MTV had no comment on the tweets.

Teen Mom kicked off in 2009 as a spinoff from 16 and Pregnant. The series lasted until 2012, but returned with specials in 2014 and then returned properly in 2015 with Teen Mom OG.

Amber and Farrah recently came into conflict at the Teen Mom OG reunion after Farrah said Amber's fiance Matt Baier looked like a pedophile because he's much older than her. Amber, Maci and Catelynn also staged a walkout during the reunion to protest what they called MTV's preferential treatment of Farrah.